Researching case law means finding published court decisions that address your legal issue and confirming those decisions still carry authority. The work moves through a predictable sequence: pin down the legal question and the jurisdiction, orient yourself with secondary sources, search free or paid databases for on-point opinions, read those opinions closely enough to separate the binding parts from the commentary, and run every case you plan to rely on through a citator. Learning how to research case law well is mostly about doing those steps in order rather than skipping to the search bar.
Frame the Question Before You Search
Before opening any database, write down what you know. The facts of your situation: who was involved, what happened, where it happened, and when. From those facts, pull out the legal questions at stake. A contract dispute raises different issues than a personal injury claim, and your search terms have to reflect that.
Then build a keyword list. Include specific terms of art like “breach of contract” or “comparative negligence,” and broader concepts like “damages” or “liability.” Add synonyms. Courts don’t always use the same vocabulary for the same idea, so a case about “wrongful termination” might also appear under “unjust dismissal” or “retaliatory discharge.”
Jurisdiction is the other thing you have to settle up front. The American legal system splits into federal courts and state courts. Federal courts handle cases involving federal statutes, constitutional questions, bankruptcy, and disputes between citizens of different states. State courts handle most criminal cases, contract disputes, personal injury claims, and family law matters.1United States Courts. Comparing Federal and State Courts Getting this right matters because a ruling from one state’s supreme court doesn’t bind courts in another state, and a decision from one federal circuit doesn’t control courts in a different circuit.
Which Decisions Actually Bind a Court
Case law rests on stare decisis, meaning courts follow their own prior rulings and lower courts are bound to follow higher courts within the same jurisdiction.2Constitution Annotated. Historical Background on Stare Decisis Doctrine That produces two categories of authority. Mandatory authority is a decision your court must follow because it comes from a higher court in the same chain: a federal district court in the Ninth Circuit, for example, must follow Ninth Circuit and U.S. Supreme Court rulings. Persuasive authority is a decision a court may consider but isn’t obligated to follow, such as an opinion from a different state’s supreme court or a different federal circuit. An argument built only on persuasive authority is weaker than one anchored in binding precedent.
There’s a second wrinkle. Federal appellate courts designate some opinions as “unpublished” or “non-precedential.” These resolve the dispute between the parties but generally don’t bind other courts, or even future panels of the same court. Since January 1, 2007, unpublished federal opinions can be cited in court filings, but they carry less weight than published decisions. Use them if they’re all you have, but anchor the argument in a published opinion whenever possible.
Start With Secondary Sources
Jumping into a case law database with a handful of keywords is one of the most common research mistakes. If you’re new to an area of law, secondary sources map the terrain first. They summarize the legal principles, explain how courts have approached the issue, and point you toward the leading decisions.
Legal encyclopedias are a good place to start. The two major national sets are American Jurisprudence (Am. Jur.) and Corpus Juris Secundum (C.J.S.), which summarize the law by topic and cite the relevant cases, statutes, and regulations.3U.S. Department of the Interior. Legal Encyclopedias You won’t cite an encyclopedia in court, but it teaches you the terminology courts use and helps you identify the leading cases in the area.
American Law Reports (A.L.R.) is the other workhorse. A single A.L.R. annotation collects and analyzes case law from across the country on a narrow legal topic, giving you a snapshot of how different jurisdictions have handled the same issue. If an annotation exists on your question, it can save hours of independent searching. These resources are available through Westlaw, LexisNexis, and many law libraries.
Where to Find the Cases
Once you have a working understanding of the area and a keyword list, you’re ready to search. The available tools run from completely free to expensive.
Free Databases
Google Scholar is the most accessible starting point. Select the “Case law” radio button below the search bar, enter your keywords, and use the “Select courts” link on the results page to filter by jurisdiction.4Library of Congress. How To Find Free Case Law Online The database covers U.S. Supreme Court opinions, federal appellate and district court decisions, and state appellate and supreme court opinions. Pasting a full citation into the search bar pulls the specific case. Google Scholar lacks the analytical tools of paid platforms, but for known-case lookups and initial keyword searches, it works.
CourtListener, run by the nonprofit Free Law Project, hosts over ten million opinions across hundreds of jurisdictions, along with the RECAP Archive of federal filings pulled from PACER.5Free Law Project. CourtListener Research and Awareness Website It has alert features that notify you when new cases mention a topic or citation you’re tracking.
For federal court records specifically, PACER provides electronic access to case documents across all federal courts. Opinions are free; other documents cost $0.10 per page with a cap at the equivalent of 30 pages per document, and accounts that accrue less than $30 in fees per quarter owe nothing.6United States Courts. Electronic Public Access Fee Schedule Many individual federal and state courts also publish recent opinions on their own websites at no cost.
If you’re an attorney, check whether your state or local bar association provides free access to Fastcase, which covers case law, statutes, and regulations. It’s a common member benefit.
Law Libraries
Public law libraries, especially those at county courthouses and law schools, often provide free walk-in access to Westlaw, LexisNexis, or both on public terminals. Remote access is usually not available, but if you need paid-platform searches without a subscription, this is the cheapest route. Librarians can also help you navigate unfamiliar databases.
Paid Platforms
Westlaw and LexisNexis are the industry-standard platforms. Beyond their case law databases, they offer features free tools can’t match: editorial headnotes summarizing individual legal points within each case, topic classification systems that group related cases, and citator services that track whether a decision has been overturned or criticized. These tools speed up research substantially, but individual subscriptions are expensive and primarily aimed at practicing attorneys and firms.
Reading a Case Citation
Every published opinion has a standard citation that tells you exactly where to find it. A typical one looks like this:
Miranda v. Arizona, 384 U.S. 436 (1966)
The italicized part is the case name. The first number (384) is the volume of the reporter. The abbreviation (U.S.) identifies the reporter, in this instance the United States Reports, which is the official reporter for U.S. Supreme Court decisions. The next number (436) is the starting page. The year in parentheses is when the decision was issued.
Common reporter abbreviations include “F.3d” and “F.4th” for the Federal Reporter (federal circuit courts), “F. Supp. 3d” for the Federal Supplement (federal district courts), and various state-specific reporters. Type any citation directly into Google Scholar, CourtListener, or a paid database to pull the full opinion.
Searching Effectively
Keyword searching works best when you use Boolean operators to control how your terms interact.
- AND retrieves only documents containing all your terms. “Landlord AND retaliation AND eviction” returns cases that discuss all three together.
- OR retrieves documents containing any of your terms. “Wrongful termination OR retaliatory discharge” captures cases using either phrase, which is useful for synonyms.
- NOT excludes documents containing a term. “Negligence NOT medical” filters out medical malpractice cases when you want general negligence.
Quotation marks force an exact phrase. Searching “attractive nuisance” returns only cases using that specific term, not cases that happen to contain “attractive” and “nuisance” separately.
Westlaw and LexisNexis also support proximity connectors. The “/p” command finds terms in the same paragraph and “/s” requires them in the same sentence. These are more precise than AND because they ensure your terms are actually discussed in connection with each other. A search like “damages /s punitive” finds sentences discussing punitive damages, not a 40-page opinion that mentions “damages” on page 3 and “punitive” on page 37.
Whichever platform you use, apply filters aggressively. Narrow by jurisdiction, date range, and court level. A search returning 5,000 results isn’t useful. Filtering to your court and the last ten years usually brings that number into a manageable range.
Reading the Opinion
Once you’ve found a relevant case, you have to read it carefully. Court opinions follow a fairly predictable structure.
The opinion opens with the caption and citation. Below that, many published opinions include a syllabus or summary prepared by the court or the reporter’s editorial staff. The syllabus helps you get oriented, but it isn’t part of the court’s official ruling and shouldn’t be treated as a statement of the law.
The body typically moves through four stages. First, the court recounts the facts. Second, it identifies the legal question it’s been asked to resolve. Third, and most important, it walks through its reasoning: which rules apply, how prior cases handled similar situations, and how the law applies to the facts at hand. Fourth, it states its holding, meaning the direct answer to the legal question and the ultimate decision.
Some opinions include concurring opinions, where a judge agrees with the result for different reasons, and dissenting opinions, where a judge disagrees with the majority. Dissents don’t carry precedential weight, but they can signal that the law in an area is unsettled.
Holding vs. Dicta
This distinction trips up a lot of researchers. The holding is the part of the opinion that directly resolves the legal question before the court. It’s the binding part, the piece future courts must follow. Dicta, short for “obiter dicta” (Latin for “said in passing”), is everything else: commentary on hypothetical scenarios, observations about related legal issues, or general musings that weren’t necessary to the decision.
Dicta can be interesting and sometimes persuasive, but it isn’t binding. If you build your argument on a passage that turns out to be dicta rather than holding, opposing counsel will point that out and the court won’t treat it as controlling. When reading, always ask: was this statement necessary to decide the issue? If not, it’s likely dicta.
Writing a Short Brief
When you find a case that matters, write a short summary that captures the essentials. The standard approach, sometimes called IRAC, has four parts: identify the Issue the court was asked to decide, state the Rule the court applied, describe how the court Applied that rule to the facts, and note the Conclusion or holding. A good brief runs half a page to a page. It forces you to actually understand the opinion rather than skim it, and it gives you a reference you can return to without rereading the whole decision.
Confirming the Case Is Still Good Law
Finding a case that supports your position is only half the work. If it was later reversed on appeal, overruled by a subsequent decision, or undermined by a change in the statute it interpreted, relying on it can damage both your argument and your credibility. Checking whether a case is still good law is the step that separates competent research from dangerous research.
Paid Citators
The most reliable tools for this are the citator services built into the major platforms. KeyCite on Westlaw uses a red flag to indicate a case that is “bad law” on at least one point, and a yellow flag to warn that a case has some negative history but hasn’t been reversed or overruled.7Thomson Reuters. KeyCite Status Flags Shepard’s on LexisNexis uses a similar system: a red signal means strong negative treatment such as being overruled, an orange signal means validity has been questioned, and a yellow signal indicates possible negative treatment such as being criticized or distinguished by another court.8LexisNexis. Shepards Signal Indicators and Analysis Phrases
A flag or signal doesn’t automatically mean the case is useless. A yellow flag might reflect criticism on a point of law unrelated to your issue. Always read the citing references to see what actually changed and whether it affects the specific principle you’re relying on.
Free Alternatives
Without KeyCite or Shepard’s, Google Scholar offers a “Cited by” link beneath each case showing later opinions that reference the decision. You won’t get color-coded flags or editorial analysis, but you can scan the citing opinions to check whether any of them overruled, reversed, or criticized the original. CourtListener also tracks citation relationships across its database.5Free Law Project. CourtListener Research and Awareness Website Neither is as comprehensive as a paid citator, but checking both is a reasonable safety net.
As a last resort, search for the case name along with terms like “overruled,” “reversed,” or “abrogated” in any case law database. This method is imprecise and won’t catch every form of negative treatment, so use it only when nothing else is available. If you’re relying on a case for anything consequential, finding a way to run it through KeyCite or Shepard’s at a law library is worth the trip.